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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f82f1ebd32b0a77d534391474a0d9b53c83462f24f05d76cc7ef2976871ecc5' 
  AND token = 'Daw0IH0uE32ztFWlBwaFgV5rLPcTXV7BR4sihIDUIpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}